BGS Lexicon of Named Rock Units
has source reference

http://data.bgs.ac.uk/ref/Lexicon/hasSourceReference
Comment"Property links to a published document that is a source reference" language=en 
Label"has source reference" language=en 
Rangehttp://www.w3.org/1999/02/22-rdf-syntax-ns#Resource
Typehttp://www.w3.org/1999/02/22-rdf-syntax-ns#Property

namespaces used
bgsrBGS Schemas
bgsreBGS RCS Earth Material Classes
bgsrgBGS Geochronology
bgsrlBGS Lexicon of Named Rock Units
bgsrmBGS 1:625 000 Digital Geological Map
dctDublin Core terms
rdfResource Description Framework
rdfsResource Description Framework - Schema
skosSimple Knowledge Organization System
xsdXML Schema Data Type